• JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
 
  Bookmark and Share
 
 
Master's Dissertation
DOI
https://doi.org/10.11606/D.8.2020.tde-29092020-183051
Document
Author
Full name
Rebeca Durço Coelho
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2020
Supervisor
Committee
Vieira, Bianca Carvalho (President)
Furquim, Sheila Aparecida Correia
Gomes, Maria Carolina Villaça
Lawall, Sarah
Title in Portuguese
Caracterização das propriedades físicas do solo e a instabilidade das encostas na Serra do Mar (Itaóca - SP)
Keywords in Portuguese
Escorregamento
Granito
Intemperismo
Propriedades Físicas do Solo
Vale do Ribeira
Abstract in Portuguese
Durante o verão de 2014, o município de Itaóca (SP) foi afetado por fortes chuvas concentradas nas cabeceiras das bacias hidrográficas que desencadearam movimentos de massa generalizados. A ocorrência de escorregamentos rasos está relacionada a inúmeros fatores, dentre eles temos o intemperismo que pode contribuir para a redução da resistência mecânica, causando uma alteração nas propriedades geotécnicas e hidráulicas do perfil, favorecendo instabilidades. O objetivo deste projeto foi caracterizar perfis de intemperismo e correlacionar algumas de suas propriedades físicas com os principais mecanismos de ruptura. Para tal, foi selecionado um talude de corte que apresentasse: I) perfil típico de intemperismo (rochas na base, corestones, etc.); II) Acesso para coleta de amostras de solo e III) Evidência de processos anteriores de escorregamentos rasos (cicatrizes de escorregamentos) no mesmo compartimento. O perfil de intemperismo foi caracterizado por descrições morfológicas do solo, granulometria, análise de porosidade, condutividade hidráulica saturada (Ksat), além de medições pelo martelo de Schmidt no maciço rochoso. Os resultados indicaram a presença de 3 camadas principais (Solo Residual Maduro, Solo Residual Jovem e Saprolito) com distintas texturas, morfologia e permeabilidade. Foram observadas significativas descontinuidades (estruturais, texturais e etc) entre o Solo Residual Maduro e o Solo Residual Jovem que podem favorecer o aparecimento de descontinuidades hidráulicas. No Solo Residual Maduro a água percolaria com maior facilidade, enquanto que no Solo Residual Jovem teria certa dificuldade devido as diferenças entre seus atributos físicos, facilitando assim a formação de uma zona saturada e surgimento de poropressões positivas contribuindo com as instabilização. Durante chuvas intensas, possíveis rupturas ocorreriam entre Residual Maduro e Residual Jovem devido principalmente a mudanças abruptas em suas propriedades físicas e permeabilidade.
Title in English
Characterization of soil physical properties and the slopes instability in the Serra do Mar (Itaóca - SP)
Keywords in English
Granite
Landslide
Ribeira River Valley
Soil Physical Properties
Weathering
Abstract in English
During the summer of 2014, the municipality of Itaóca (SP) was affected by concentrated heavy rains at the headwaters of the watersheds that triggered widespread mass movements. The shallow landslides occurrence is related to numerous factors, among them, the weathering that can contribute to the reduction of mechanical resistance, causing a change in the geotechnical and hydraulic properties of the profile, thus favoring instabilities. The project aimed to characterize weathering profiles and to correlate some of its physical properties with the main rupture mechanisms. For this purpose, a cut slope was selected containing: I) Typical weathering profile (rocks at the base, corestones, etc.); II) Easy access to collect soil samples, and III) Evidence of past shallow landslide (landslides scars) in the same compartment. The weathering profile was characterized by soil morphological descriptions, particle size, porosity analysis, and saturated hydraulic conductivity (Ksat), in addition to measurements by the Schmidt hammer in the rock mass. The results indicated the presence of 3 main layers (Mature Residual Soil, Young Residual Soil, and Saprolite) with distinct textural, morphological, and permeability differences. It was observed significant discontinuities (e.g. structural, textural) between the Mature Residual Soil and the Young Residual Soil that may facilitate the appearance of hydraulic discontinuities. In the Residual Maduro the water would percolate more quickly, but it would have some difficulty at Residual Jovem due to the differences between its physical attributes, furthering the formation of a saturated zone and the appearance of positive pore pressure, contributing to instability. During intense rainfall, possible ruptures would occur between Residual Maduro and Residual Jovem due mainly to abrupt changes in their physical properties and permeability.
 
WARNING - Viewing this document is conditioned on your acceptance of the following terms of use:
This document is only for private use for research and teaching activities. Reproduction for commercial use is forbidden. This rights cover the whole data about this document as well as its contents. Any uses or copies of this document in whole or in part must include the author's name.
Publishing Date
2020-09-29
 
WARNING: Learn what derived works are clicking here.
All rights of the thesis/dissertation are from the authors
CeTI-SC/STI
Digital Library of Theses and Dissertations of USP. Copyright © 2001-2020. All rights reserved.